Siemens 5-GMI-250 - Page 32

Maintenance
&
Overhaul
Page
29
10
.
Perform
contact
resistance
tests
of
the
primary
contacts
using
a
ductor
.
Contact
resistance
should
not
exceed
the values listed
in
Table
4
Table
4
.
Maximum
Contact
Resistance
Current
Rating
(
Amps
)
Contact
Resistance
(
Micro
-
Ohms
)
60
1200
2000
40
3000
20
11
.
Make
a
permanent
record
of
all
tests
performed
.
Inspection
and
Cleaning
of
Breaker Insulation
1
.
Perform
the
Spring
Discharge
Check
on
the
circuit
breaker
,
after
all
control
power
is
removed
.
The
Spring
Discharge
Check
consists
of
1
)
depressing
the
red
Trip
pushbutton
,
2
)
then
depressing
the
green
Close
push
-
button
,
and
3
)
again
depressing
the
red
Trip
pushbutton
.
All
of
these
controls
are on
the breaker
front
panel
.
Visually
verify
the
Discharge
condition
of
the
springs
.
2
.
Remove
any
interphase
and
outer
phase
barriers
as
shown
in
Figure
51
.
3
.
Clean
barriers
and
post
insulators
using
clean
rags
and
one
of
the
following
cleaning
solvents
:
•
Soap
and
water
•
Either
No
.
1
or
No
.
2
denatured alcohol
•
White
kerosene
•
Varsol
No
.
2
•
VM
&
Naptha
•
Either
isopropyl
or
isobutyl
alcohol
Figure
51
.
Rear View
Showing
Outer
Phase Barriers
.
^
CAUTION
Do
not
use
any
cleaning
compounds
con
-
taining
chlorinated
hydrocarbons
such
as
trichlorethylene
,
perchlorethylene
or car
-
bon
tetrachloride
.
These
compounds
will
damage
the
phenlylene
ether
coplymer
material
used
in
the barriers and
other
insulation
on
the
circuit
breaker
.
4
.
Replace
all
barriers
.
Check
all visible
fasteners
again
for
condition and
tightness
.
Functional
Tests
Refer
to
the
Installation
Checklist
in
the
Installation
Checks
&
Initial
Functional
Tests
section
of
this
manual
.
Functional
tests
consist
of
performing
at
least
three
(
3
)
Manual
Spring
Checks
and
three
(
3
)
Automatic
Spring
Charging
Checks
.
After
these
tests
are
complete
,
and
the
springs
fully
dis
-
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